Anti-rotation sleeve fastening structure of ball screw pair for drive-by-wire braking

Abstract

The utility model discloses an anti-rotation sleeve fastening structure of a ball screw pair for drive-by-wire braking, which comprises an anti-rotation sleeve, a ball screw pair penetrates through the center of the anti-rotation sleeve, one end of the anti-rotation sleeve is provided with a large base and a small base, the large base floats on the surface of a valve body, the small base sinks into the valve body, and the large base and the small base are jointly provided with a through hole; a threaded hole is formed in the bottom of the sinking groove; a plug screw penetrates through the through hole and the countersunk groove to be screwed into the threaded hole, and the head of the plug screw is exposed out of the large base; and the rubber sleeve is sleeved outside the small base and is clamped between the sinking groove and the small base. According to the utility model, a standard part is used for connection, and the heightened and thickened rubber sleeve is arranged between the anti-rotation sleeve and the valve body, so that space is reserved for the anti-rotation sleeve to adapt to manufacturing of a ball screw pair and proper adjustment of assembly errors, and the problem of coaxiality of the main cylinder piston and the ball screw pair is solved.

Description

Technical Field

[0001] The utility model relates to a ball screw pair structure, in particular to a ball screw pair anti-rotation sleeve fastening structure for automobile wire control. Background Art

[0002] Most automotive wire-controlled brakes use a ball screw pair as a transmission structure to convert the motor's rotational motion into linear motion that pushes the master cylinder piston. The ball screw pair is a combination of a screw and a nut. The screw part rotates with the motor rotor, and the nut is threaded onto the screw. One end of the nut is connected to the master cylinder piston. When the screw rotates, the nut will move along the axial direction of the screw, thereby driving the master cylinder piston to perform linear motion, thereby converting the motor's rotational motion into linear motion of the master cylinder piston.

[0003] In this structure, preventing the nut from rotating with the lead screw is crucial, as is ensuring the coaxiality of the master cylinder piston and the ball screw pair. Typically, an anti-rotation sleeve assembly is designed, consisting of an anti-rotation sleeve and its fastening structure. For brake-by-wire systems, the motor is mounted on the valve body of the brake-by-wire system, the motor rotor is connected to the lead screw, and the anti-rotation sleeve is mounted around the common periphery of the lead screw and nut, with one end secured by the valve body. A guide is provided between the inner wall of the anti-rotation sleeve and the outer wall of the nut to prevent the nut from rotating.

[0004] One end of the master cylinder piston is supported by the master cylinder barrel, and the other end is supported by the motor and ball screw pair. The anti-rotation sleeve assembly is located in the middle. Therefore, the installation of the anti-rotation sleeve assembly should be flexible so that it can automatically maintain coaxiality with the ball screw pair. Therefore, the installation of the anti-rotation sleeve becomes critical. Utility Model Content

[0005] The utility model provides a wire-controlled actuation ball screw pair anti-rotation sleeve fastening structure, aiming to solve the anti-rotation sleeve fixing problem, and also solves the anti-rotation sleeve posture self-adaptation problem to ensure its coaxiality with the ball screw pair.

[0006] The technical solution of the utility model is: a ball screw pair anti-rotation sleeve fastening structure for wire control actuation, comprising an anti-rotation sleeve, the ball screw pair passing through the center of the anti-rotation sleeve, one end of the anti-rotation sleeve being fixed to a valve body, characterized in that: a large base and a small base are provided at one end of the anti-rotation sleeve connected to the valve body, the large base floats on the surface of the valve body, the small base is sunk into the valve body, and a through hole is formed on both the large base and the small base;

[0007] The valve body is provided with a sinking groove, and the bottom of the sinking groove is provided with a threaded hole;

[0008] a punch screw passing through the through hole and the countersunk groove from top to bottom and screwed into the threaded hole, wherein the head of the punch screw is exposed on the upper surface of the large base;

[0009] A rubber sleeve is sleeved outside the small base and clamped between the sink and the small base.

[0010] Furthermore, the large base and the small base are integrally formed, the large base extends radially along the cylinder, and the small base extends axially along the cylinder on the back side of the large base.

[0011] Furthermore, three small bases are evenly distributed on the large base.

[0012] Furthermore, the diameter of the polished rod portion of the plug screw is smaller than the through holes on the large base and the small base.

[0013] Furthermore, the rubber sleeve protrudes out of a portion of the sink to support the large base.

[0014] Furthermore, the rubber sleeve is a thick-walled rubber sleeve.

[0015] The technical advantages of this utility model are:

[0016] 1. No special tools or fasteners are needed. The anti-rotation sleeve can be fastened by screwing with standard parts. No special pressing tools are required and it can be easily disassembled at any time.

[0017] 2. A large and a small base are set at the bottom of the anti-rotation sleeve. The small base is inserted into the valve body, which can reduce the diameter of the base part and provide more space for the rubber sleeve outside the small base, so that a thicker rubber sleeve can be used.

[0018] 3. A rubber sleeve is added between the anti-rotation sleeve and the valve body to create a certain gap between the large base and the valve body, so that the anti-rotation sleeve can be displaced or rotated appropriately to adapt to the manufacturing and assembly errors of the ball screw nut.

[0019] 4. The perforations in the large and small bases at the bottom of the anti-rotation sleeve are larger than the diameter of the plug screws, and a gap is left circumferentially, so that the anti-rotation sleeve can be rotated or translated in any direction by squeezing the rubber sleeve, which can better adapt to the axis misalignment problem caused by the processing and assembly errors of the motor and transmission system.

[0020] 5. By placing the head of the plug screw outside the anti-rotation sleeve, the diameter of the screw-mounting portion of the anti-rotation sleeve is effectively reduced, thereby making more thickness space for the rubber sleeve, effectively increasing the thickness of the rubber sleeve, and thus increasing the movable space of the anti-rotation sleeve.

[0021] 6. The step at the end of the smooth rod of the plug screw rests against the groove surface of the valve body, which can easily make the three screws screwed in to the same depth, thereby ensuring that the tightening force of the anti-rotation sleeve is consistent in all directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a cross-sectional view of the overall structure of the utility model;

[0023] Figure 2 yes Figure 1 The partial enlarged view of part B in the middle shows the connection between the anti-rotation sleeve and the valve body;

[0024] Figure 3 It is a partial cross-sectional view of the anti-rotation sleeve, showing the large base and the small base;

[0025] Figure 4 It is a partial cross-section of the valve body showing the grooves and threaded holes.

[0026] Numbers in the figure: 1, anti-rotation sleeve, 2, plug screw, 3, rubber sleeve, 4, valve body, 5, screw, 6, nut, 11, large base, 12, small base, 13, through hole, 41, countersunk groove, 42, threaded hole. DETAILED DESCRIPTION

[0027] To make the technical solutions and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] like Figure 1 、 2 As shown, the utility model provides a fastening structure for an anti-rotation sleeve of a ball screw pair for wire control, the purpose of which is to facilitate adjustment of the radial margin of the anti-rotation sleeve to ensure the coaxiality of the ball screw pair and the anti-rotation sleeve.

[0029] The ball screw assembly anti-rotation sleeve fastening structure includes: an anti-rotation sleeve 1, a plug screw 2, and a rubber sleeve 3. One end of the anti-rotation sleeve 1 is mounted on the valve body 4; the ball screw assembly's lead screw 5 and nut 6 pass through the center of the anti-rotation sleeve 1, and the lead screw 5 is inserted into the interior of the valve body 4 and connected to the motor output terminal within the valve body; the nut 6 is sleeved on the outer wall of the lead screw 5 and is threadedly engaged with the lead screw 5; the outer wall of the nut 6 and the inner wall of the anti-rotation sleeve 1 are connected by relatively arranged axial grooves and ridges (this is a conventional design, not shown in the figure). The grooves and ridges cooperate to guide the axial movement of the nut and prevent the nut from rotating. Furthermore, a clearance is left between the grooves and ridges to allow space for adjusting the position of the anti-rotation sleeve 1.

[0030] The installation method of the anti-rotation sleeve 1 on the valve body 4 is the key to ensure its coaxiality with the ball screw pair. Figure 3As shown, in this utility model, a large base 11 is provided at the end connecting the anti-rotation sleeve 1 to the valve body 4. A small base 12 is provided on the side of the large base 11 facing away from the body. The large base 11 extends radially along the body's base, while the small base 12 extends axially behind the large base 11. The large and small bases 11 and 12 are integrally formed, and the joint portion of the large and small bases 11 and 12 has a common through-hole 13 for receiving the plug screw 2. Furthermore, based on the principle that three points determine a plane, three small bases 12 can be evenly spaced on the large base 11.

[0031] The large base 11 enlarges the cross section of the cylinder in order to increase the contact area with the valve body 4, and the small base 12 is extended in order to be inserted into the valve body 4. Figure 4 As shown, the valve body 4 is provided with a recessed groove 41, with a threaded hole 42 at its bottom. The small base 12 is sunken into the recessed groove 41, allowing the large base 11 to float above the valve body surface. The tamping screw 2 passes from top to bottom through the through-hole 13 and the recessed groove 41 and screws into the threaded hole 42. The head of the tamping screw 2 presses against the upper surface of the large base 11 without sinking into the through-hole. This makes pressure control easier, and it is easier to ensure consistent tightening force for each tamping screw 2 than with a sunken installation method. Furthermore, the diameter of the smooth rod of the tamping screw 2 is smaller than the through-holes 13 in the large and small bases, leaving space for the anti-rotation sleeve to move.

[0032] A rubber sleeve 3 is positioned within the recessed groove 41 of the valve body 4. The rubber sleeve 3 sits within the recessed groove 41 and extends beyond the small base 12. The rubber sleeve 3 creates a compression space for adjusting the position of the anti-rotation sleeve 1. On the one hand, the rubber sleeve 3 is pressed between the small base 12 and the recessed groove 41, providing space for radial movement and even slight rotation of the anti-rotation sleeve 1 relative to the screw 5, enabling radial adjustment of the anti-rotation sleeve 1 relative to the screw 5. Furthermore, the thicker the rubber sleeve 3, the greater the elastic compression space it provides. On the other hand, the rubber sleeve 3 partially protrudes from the recessed groove 41 and is pressed between the large base 11 and the recessed groove 41, providing space for axial movement of the anti-rotation sleeve 1 relative to the screw 5, enabling axial adjustment of the anti-rotation sleeve 1 relative to the screw 5. Furthermore, the higher the rubber sleeve 3 protrudes, the greater the compression space it creates between the large base 11 and the recessed groove 41. Therefore, the taller and thicker the rubber sleeve 3, the greater the adjustable margin. The downward pressure applied by the driving screw 2 determines the axial displacement of the anti-rotation sleeve 1 and the screw 5. The wall thickness of the small base 12 does not need to be too thick, and can leave enough space for the rubber sleeve.

[0033] As can be seen from the above, the present invention achieves coaxial alignment between the anti-rotation sleeve and the ball screw through the simple structural arrangement described above. Since the smooth portion of the piercing screw 2 passes through the perforation, it also protects the anti-rotation sleeve 1, eliminating the risk of wear on the large base 11 and small base 12. The piercing screw 2 is a standard component and requires no specialized processing or tools for screwing.

Claims

1. A ball screw anti-rotation sleeve fastening structure for wire-controlled actuation, comprising an anti-rotation sleeve (1), wherein the ball screw passes through the center of the anti-rotation sleeve (1), and one end of the anti-rotation sleeve (1) is fixed to a valve body (4), characterized in that: One end of the anti-rotation sleeve (1) connected to the valve body (4) is provided with a large base (11) and a small base (12), the large base (11) floats on the surface of the valve body (4), and the small base (12) is sunk into the valve body (4), and a through hole (13) is formed on both the large base (11) and the small base (12); The valve body (4) is provided with a sinking groove (41), and a threaded hole (42) is provided at the bottom of the sinking groove (41); A driving screw (2) passes through the through hole (13) and the recess (41) from top to bottom and is screwed into the threaded hole (42), with the head of the driving screw (2) exposed on the upper surface of the large base (11); A rubber sleeve (3) is sleeved outside the small base (12) and is clamped between the sink (41) and the small base (12).

2. The anti-rotation sleeve fastening structure for a ball screw pair for wire control according to claim 1, characterized in that: The large base (11) and the small base (12) are integrally formed; the large base (11) extends radially along the cylinder; and the small base (12) extends axially along the cylinder on the back side of the large base (11).

3. The anti-rotation sleeve fastening structure for a ball screw pair for wire control according to claim 1 or 2, characterized in that: Three small bases (12) are evenly distributed on the large base (11).

4. The anti-rotation sleeve fastening structure for a ball screw pair for wire control according to claim 1, characterized in that: The diameter of the polished rod portion of the plug screw (2) is smaller than the through hole (13).

5. The anti-rotation sleeve fastening structure for a ball screw pair for actuation by wire according to claim 1, characterized in that: The rubber sleeve (3) protrudes a portion of the sink (41) to support the large base (11).

6. The anti-rotation sleeve fastening structure for a ball screw pair for actuation by wire according to claim 1 or 5, characterized in that: The rubber sleeve (3) is a thick-walled rubber sleeve.

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